Gas fired burner



Nov. 8, 1960 N. BARNES ETAL 2,959,217

GAS FIRED BURNER v Filed July 9, 1956 2 Sheets-Sheet 1 AT TOENEY UnitedStates Patent GAS FIRED BURNER Norman Barnes, Wadhurst, Norman WalterRickwood, Kllburn, London, and Richard George Sargent, Kings Langley,England, assignors to Ascot Gas Water Heaters Limited, London, EnglandFiled July 9, 1956, Ser. No. 596,675

Claims priority, application Great Britain July 11, 1955 1 Claim. (Cl.158-114) According to the present invention in a gas fired apparatusthere is provided at least one gas burner having a gas supply pipeleading to a flared burner mouth containing a series of spacedlongitudinally extending strips, the strips being of a varying depthsuch that in use the burner produces flames whose height issubstantially constant along the length of the burner mouth.

Preferably there is provided a plurality of such burners each secured toa burner support bar and each supplied with gaseous fuel from a commonburner manifold via an individual injector. The burner assembly wouldnormally be mounted beneath a combustion chamber secured to a panel andin one embodiment the burner manifold is mounted between burnersupporting brackets which thus provide a rigid support so reducing to aminimum relative movement between the combustion chamber and the burnermouths.

By way of example only, a burner assembly in accordance with theinvention will now be described in greater detail with reference to theaccompanying drawings of which:

Figure 1 is a side elevation of a single burner,

Figure 2 is a side elevation of a bafile bar,

Figure 3 is a front elevation of a burner assembly, and

Figure 4 is a plan view of the assembly of Figure 3.

Referring now to Fig. 1 it will be seen that each burner consists of agas supply pipe 15 the lower end 16 of which is belled slightly andsecured in a hole in the support bar. The upper end of the pipe isflared outwardly as 17 to form a burner mouth 18 of rectangular formwhen seen in plan view. The width of the mouth approximates to thediameter of the gas supply pipe 15 whilst its length greatly exceedsthat diameter. The internal diameter of the gas supply increasesslightly from its connection with the support bar 13 to the start offlaring. The depth of the flared part is slightly greater at its centrethan at its ends. Secured by bolts 19 inside the mouth are a number ofstrips 20 of metal arranged parallel with the longer side of the burnermouth. The strips form baflie bars and are spaced from one another andfrom the longer sides of the burner mouth by spacing means on the boltsand the upper surfaces of the bars. lie in the same plane as the upperedges of the burner mouth. As can be seen in Fig. 2 the depth of thecentral part 21 of each bar is greater than that of the end parts andthere is a regular increase in depth as at 22 from the end parts 23where the depth is constant to the centre part when again the depth is.constant, Local variations of the contour just described can be made tosuit specific requirements. The effect of the selected contour of bar isto produce when the burner is in operation a flame height which ispractically constant along the length of the burner month.

Each burner is of sheet metal construction and is formed in two partswelded together along a longitudinal seam. Instead of using spacerelements to space the baffle bars across the burner month, each bar maybe tapped and screwed on to the fixing bo-lts. Alternatively, a fixingrod may be used which is pinched at intervals to hold the bars in spacedrelationship and at its ends to hold the rod in position on the burner.

Secured between two burners is a plate 24 to which is fitted a pilotburner (not shown) which controls a pilot safety device, for example, ofthe electromagnetic type in which the pilot burner flame heats athermocouple supplying E.M.F. to an electromagnet which holds open avalve in the gas supply conduit for as long as gas issuing from thepilot burner is ignited. The electromagnet is normally of insuflicientstrength to open the valve from its closed position so that a manuallyoperable resetting device is fitted to open the valve again after it hasclosed.

We claim:

A gas burner for a gas fired appliance comprising in combination, a gassupply pipe, a flared burner mouth connected centrally to said gassupply pipe, and, in said burner mouth, a series of longitudinal stripsspaced closely to each other and to the walls of said burner mouth andcreating frictional resistance to flow therebetween, said strips eachhaving an upper edge lying in the plane of the top of said mouth and alower edge extending well into said burner mouth and creating additionalfrictional flow at said portions, a central portion in line with andapproximately the width of said gas supply pipe and over which thedistance between said upper and lower edges is substantially constant ata maximum value, an intermediate portion on each side of said centralportion over which said distance decreases from said maximum to a lowervalue and outer potrions adjoining said intermediate portion over whichsaid depth is substantially constant at said lower value, a centraltransverse securing element and outer transverse securing elements allpassing across said burner mouth through each longitudinal strip wherebythe latter are secured in position in the burner mouth, said securingelements passing through said strips between the upper and lower edgesthereof, said central securing element being located in said centralportion and said outer securing elements being located in said outerportions.

References Cited in the file of this patent UNITED STATES PATENTS611,248 Gray et a1. Sept. 27, 1898 1,063,412 Buckman June 3, 19131,927,422 Sonner Sept. 19, 1933 2,159,284 Miller May 23, 1939 2,242,176Denise May 13, 1941 2,327,339 Chandler Aug. 24, 1943 2,541,428 Leo Feb.13, 1951

